Originally Posted by freightdog

We would fly our Chieftains at 75 rich of peak at I believe 26". down from 30". There was a considerable drop in airspeed (about 15-20 knots). But we were told we were saving money on gas, but I was never sure because of the drop in airspeed we were in the air longer. We went to the richer side of peak also because we were getting cracked cylinders at the higher operating temps.